panic: ptrace status unexpected: got 9, wanted stopped

goroutine 5849468 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).wait(0xc002adf770, 0x0, 0xb12b)
	pkg/sentry/platform/ptrace/subprocess.go:323 +0x3fb
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscall(0xc002adf770, 0xc002219ad0, 0xc002219c60, 0x6, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:410 +0x126
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*thread).syscallIgnoreInterrupt(0xc002adf770, 0xc002adf780, 0x9, 0xc002219c60, 0x6, 0x6, 0x6, 0xc000d5d2e8, 0x5)
	pkg/sentry/platform/ptrace/subprocess.go:430 +0xc2
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).syscall(0xc0004fd080, 0x9, 0xc002219c60, 0x6, 0x6, 0x0, 0x0, 0x0)
	pkg/sentry/platform/ptrace/subprocess.go:562 +0xe8
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).MapFile(0xc0004fd080, 0x1b2d920000, 0xb, 0x7be6000, 0x8be6000, 0x1b00000101, 0xc000d5d2e8, 0x6)
	pkg/sentry/platform/ptrace/subprocess.go:571 +0x107
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).MapInto(0xc00014bb00, 0xd09240, 0xc0004fd080, 0x1b2d920000, 0x7be6000, 0x8be6000, 0x101, 0x6, 0xc002219d90)
	pkg/sentry/platform/filemem/filemem.go:512 +0xeb
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).mapASLocked(0xc000d5cc80, 0xc000d5d2e8, 0x5, 0x1b2d920000, 0x1b2d921000, 0x1b2d920000, 0x1b2d921000, 0x0)
	pkg/sentry/mm/address_space.go:184 +0x176
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).HandleUserFault(0xc000d5cc80, 0xd09c00, 0xc002518000, 0x1b2d920000, 0x1, 0x7f57988a68d8, 0x0, 0x1)
	pkg/sentry/mm/syscalls.go:70 +0x27f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc002518000, 0xcfca00, 0x0)
	pkg/sentry/kernel/task_run.go:255 +0x77b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc002518000, 0x7395)
	pkg/sentry/kernel/task_run.go:95 +0x163
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0xfe